A Louisiana man has been arrested for decapitating his 7-year-old disabled son and leaving his head by the side of a road for his mother to see, cops said.

Jeremiah Lee Wright, 30, told police he did it because he was tired of taking care of the boy, who suffered from cerebral palsy and required a wheelchair and feeding tube, authorities told The Daily Comet newspaper.

The grisly slaying was discovered Sunday afternoon when a passing motorist spotted Jori Lirette's severed head lying by the side of a road in Thibodaux, La., the paper reported.

Lirette's devastated mother, Jesslyn Lirette, called Wright - her live-in boyfriend of 10 years - the "devil" who took her "angel" away.

She said Jori loved his father "more than anything ... and he still killed him. He killed my baby."

Cops found Jori's body in a white trash bag near where his head was discovered. The boy's feet and one hand were cut off and stuffed inside the bag.

Police said Wright admitted chopping the boy's head off with a meat clever while his mother was out getting her pickup truck repaired.